In the legislative session that ended in June, a lawmaker filibustered and killed a measure that would have placed a cap on the law.

That's been a conservative argument since 2003, when the Republicans gained the majority and the Democrats began filibustering.

Senate Republicans have been filibustering for the last three months to block consideration of a Democratic version of the homeland security legislation, which retained some union and civil service protection.

Origen

Late 18th century: from Frenchflibustier, first applied to pirates who pillaged the Spanish colonies in the West Indies. In the mid 19th century (via Spanishfilibustero), the term denoted American adventurers who incited revolution in several Latin American states, whence sense 2 of the noun. The verb was used to describe tactics intended to sabotage US congressional proceedings, whence sense 1 of the noun.

A filibuster was an 18th-century pirate of the Caribbean. The word links a number of languages, reaching back through Spanish and French to vrijbuiter, from vrij ‘free’, and buit ‘booty’, a Dutch word from which we also get freebooter. In the 19th century the Spanish filibustero was used for American adventurers who stirred up revolution in Central and South America, and filibuster came to be used in the USA to describe behaviour in congressional debates intended to sabotage proceedings. From this we get the current sense, ‘a very long speech made in Parliament to prevent the passing of a new law’, which links the long-ago pirates with politicians of today.